Ask about the Silk Road

Quest Text I heard... that Silk Road in the past...
made trading... a lot easier...

Summary Silk Road... is an east-west trade route founded during the reign of the first king of Valencia.
Connecting Calpheon, Serendia, Mediah, and Valencia,
this land route was called Silk Road... because silk was a major product from Calpheon and Valencia.
Due to a long-sustained war, the trade route has gone missing now...